A plant illumination device may include an elongate body comprising: a light propagating section, a light quenching section coupled to a first end of the light propagating section, and, optionally, a light conducting apex coupled to a second end of the light propagating section. In some embodiments, the light conducting apex acquires light which propagates to the light propagating section. The light propagating section may be positioned in proximity to a non-root portion of a plant and the light quenching section in proximity to a root system of the plant. In some embodiments, the light is prevented from reaching the root system of the plant by the light quenching section. In some embodiments, the light includes sunlight, green light, or red light.
